The Atari Jaguar was Atari's second (and last!) console to support overlays. Only a small number of Jaguar games actually use overlays. The overlays slip into the Jaguar controller over the numeric keypad (they also work just fine in the Jaguar Pro Controller). Aliens vs. Predator is unique in that it came packaged with three controllers--you'd use a different overlays depending on whether you're playing the marine, alien or predator. Unlike 5200 overlays, which were generally pretty plain (and in fact all of Atari's overlays used the same exact style), Jaguar overlays are more varied in their appearance.